glus_image_hdr.c File Reference

#include "GL/glus.h"

Functions
GLUSvoid	_glusImageGatherSamplePoints (GLUSint sampleIndex[4], GLUSfloat sampleWeight[2], const GLUSfloat st[2], GLUSint width, GLUSint height, GLUSint stride)
GLUSboolean	_glusFileCheckRead (FILE *f, size_t actualRead, size_t expectedRead)
GLUSboolean	_glusFileCheckWrite (FILE *f, size_t actualWrite, size_t expectedWrite)
GLUSboolean GLUSAPIENTRY	glusImageCreateHdr (GLUShdrimage *hdrimage, GLUSint width, GLUSint height, GLUSint depth, GLUSenum format)
	Creates a HDR image. More...
GLUSboolean GLUSAPIENTRY	glusImageLoadHdr (const GLUSchar *filename, GLUShdrimage *hdrimage)
	Loads a HDR file. More...
GLUSboolean GLUSAPIENTRY	glusImageSaveHdr (const GLUSchar *filename, const GLUShdrimage *hdrimage)
	Saves a HDR file. More...
GLUSvoid GLUSAPIENTRY	glusImageDestroyHdr (GLUShdrimage *hdrimage)
	Destroys the content of a HDR structure. More...
GLUSboolean GLUSAPIENTRY	glusImageSampleHdr2D (GLUSfloat rgb[3], const GLUShdrimage *hdrimage, const GLUSfloat st[2])
	Samples a RGB color value from a HDR 2D image. More...

Function Documentation

GLUSboolean _glusFileCheckRead	(	FILE *	f,
		size_t	actualRead,
		size_t	expectedRead
	)

GLUSboolean _glusFileCheckWrite	(	FILE *	f,
		size_t	actualWrite,
		size_t	expectedWrite
	)

GLUSvoid _glusImageGatherSamplePoints	(	GLUSint	sampleIndex[4],
		GLUSfloat	sampleWeight[2],
		const GLUSfloat	st[2],
		GLUSint	width,
		GLUSint	height,
		GLUSint	stride
	)

GLUSboolean GLUSAPIENTRY glusImageCreateHdr	(	GLUShdrimage *	hdrimage,
		GLUSint	width,
		GLUSint	height,
		GLUSint	depth,
		GLUSenum	format
	)

Creates a HDR image.

Parameters

hdrimage	The structure to fill the HDR data.
width	Width of the image.
height	Height of the image.
depth	Depth of the image.
format	Format of the image.

Returns

GLUS_TRUE, if creating succeeded.

GLUSvoid GLUSAPIENTRY glusImageDestroyHdr

(

GLUShdrimage *

hdrimage

)

Destroys the content of a HDR structure.

Has to be called for freeing the resources.

Parameters

hdrimage

The HDR file structure.

GLUSboolean GLUSAPIENTRY glusImageLoadHdr	(	const GLUSchar *	filename,
		GLUShdrimage *	hdrimage
	)

Loads a HDR file.

Parameters

filename	The name of the file to load.
hdrimage	The structure to fill the HDR data.

Returns

GLUS_TRUE, if loading succeeded.

GLUSboolean GLUSAPIENTRY glusImageSampleHdr2D	(	GLUSfloat	rgb[3],
		const GLUShdrimage *	hdrimage,
		const GLUSfloat	st[2]
	)

Samples a RGB color value from a HDR 2D image.

Sampling uses a bilinear filter.

Parameters

rgb	The resulting, sampled RGB color value.
hdrimage	The HDR image structure, containing the 2D texel data.
st	Texture coordinate, where to sample the 2D texture.

Returns

GLUS_TRUE, if sampling succeeded.

GLUSboolean GLUSAPIENTRY glusImageSaveHdr	(	const GLUSchar *	filename,
		const GLUShdrimage *	hdrimage
	)

Saves a HDR file.

Parameters

filename	The name of the file to save.
hdrimage	The structure with the HDR data.

Returns

GLUS_TRUE, if saving succeeded.